@misc{Szymura_Tomasz_Changes_2008,
 author={Szymura, Tomasz},
 volume={Nr 54 cz. II},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Kraków},
 journal={Studia Naturae},
 howpublished={online},
 year={2008},
 publisher={Institute of Nature Conservation of the Polish Academy of Sciences},
 language={pol},
 type={Text},
 title={Changes in vitality, size and age structure of silver fir populations at the northern boundary of its range in Western Poland},
 URL={http://www.rcin.org.pl/Content/119493/PDF/KR038_94849_r2008-t54-2_SN-Szymura-185-198.pdf},
 keywords={protected natural areas, fir forest, silver fir, Abies alba},
}